Hot expanded steel pipe is just a manufacturing process of steel pipe, welded pipe and seamless steel pipe can be hot expanded.
We often refer to the hot expanded tube refers to the lower density but the contraction is very strong steel pipe, (seamless steel pipe) can be referred to as hot expanded tube.
Seamless steel pipe: the product adopts high-quality coil plate, after passing the re-inspection of the longitudinal shear or strip coil for automatic forming and fusion, in the computer control of the optimal fusion temperature at the same time, to remove the internal and external burrs of the steel pipe, non-destructive testing of the qualified steel pipe in the atmosphere of the whole with little oxidation is heated to 910 ℃-950 ℃ out of the degree of scale by the tension reducer multiple rolling, so that all parts of the steel pipe metallurgical organization, Grain state, geometric dimensions and mechanical properties of the steel pipe in a comprehensive and uniform.
Seamless pipe production classification - hot-rolled pipe, cold-rolled pipe, cold-drawn pipe, extruded pipe, pipe jacking
1. Seamless steel pipe for structural use (GB/T8162-2008) is a seamless steel pipe used for general structure and mechanical structure.
2. Seamless steel pipe for fluid transportation (GB/T8163-2008) is a general seamless steel pipe used for transportation of water, oil, gas and other fluids.
3. Seamless Steel Pipe for Low and Medium Pressure Boilers (GB3087-2008) is a hot-rolled and cold-drawn (rolled) seamless steel pipe of high-quality carbon structural steel used in the manufacture of superheated steam pipes for low and medium pressure boilers of all kinds of structures, boiling water pipes, and superheated steam pipes for locomotive boilers, large flue gas pipes, small flue gas pipes and arching brick pipes.
4. High-pressure boiler seamless steel pipe (GB5310-2008) is used in the manufacture of high-pressure and above the pressure of water pipe boiler heating surface with high-quality carbon steel, alloy steel and stainless heat-resistant steel seamless steel pipe.
5. High-pressure seamless steel pipe for chemical fertilizer equipment (GB6479-2000) is a high-quality carbon structural steel and alloy steel seamless steel pipe for chemical equipment and pipelines with working temperature of -40~400℃ and working pressure of 10~30Ma.
6. Seamless steel pipe for petroleum cracking (GB9948-2006) is seamless steel pipe for furnace pipe, heat exchanger and pipeline of petroleum refinery.
7. Steel pipes for geological drilling (YB235-70) are steel pipes used for core drilling by geological departments, which can be classified into drill pipes, drill collars, core tubes, casing and precipitation tubes according to their uses.
8. Seamless steel pipe for diamond core drilling (GB3423-82) is seamless steel pipe for diamond core drilling drill pipe, core pipe and casing.
9. Oil drilling pipe (YB528-65) is a seamless steel pipe used for oil drilling with thickening inside or outside at both ends. Steel pipe is divided into two kinds of car silk and not car silk, car silk pipe with joints coupling, not car silk pipe with butt welding method and tool joints coupling.
10. Carbon steel seamless steel pipe for ships (GB5213-85) is the manufacture of ships I pressure-resistant pipe system, II pressure-resistant pipe system, boilers and superheaters with carbon steel seamless steel pipe. Carbon steel seamless steel pipe wall operating temperature does not exceed 450 ℃, alloy steel seamless steel pipe wall operating temperature exceeds 450 ℃.
11. Automotive half shaft casing seamless steel pipe (GB3088-82) is the manufacture of automotive half shaft casing and drive axle housing axle tube with high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe.
12. High-pressure oil pipe for diesel engine (GB3093-86) is a cold-drawn seamless steel pipe for manufacturing high-pressure pipe for diesel engine injection system.
Seamless Steel Tubes
13.Precision I.D. Seamless Steel Tubes for Hydraulic and Pneumatic Cylinder Barrels (GB8713-88) are cold-drawn or cold-rolled precision seamless steel tubes with precision I.D. dimensions for manufacturing hydraulic and pneumatic cylinder barrels.
14. Cold-drawn or cold-rolled precision seamless steel pipe (GB3639-83) is used for mechanical structures, hydraulic equipment with high dimensional accuracy and good surface finish of cold-drawn or cold-rolled precision seamless steel pipe. Selection of precision seamless steel pipe manufacturing mechanical structure or hydraulic equipment, etc., can greatly save machining hours, improve material utilization, while helping to improve product quality.
15. Structural stainless steel seamless steel pipe (GB/T14975-1994) is widely used in chemical, petroleum, textile, medical, food, machinery and other industries, corrosion-resistant piping and structural components and parts of the stainless steel made of hot-rolled (extrusion, expansion) and cold-drawn (rolled) seamless steel pipe.
16. Stainless steel seamless pipes for fluid transportation (GB/T14976-1994) are hot rolled (extruded, expanded) and cold drawn (rolled) seamless steel pipes made of stainless steel used for the transportation of fluids.
17. Shaped seamless steel pipe is in addition to the round tube of other cross-sectional shape of the seamless steel pipe. According to the different dimensions of the cross-section shape of the pipe can be divided into equal wall thickness profiled seamless steel pipe (code D), unequal wall thickness profiled seamless steel pipe (code BD), variable diameter profiled seamless steel pipe (code BJ). Profiled seamless steel pipe is widely used for various structural parts, tools and mechanical parts. Compared with the round tube, the profiled tube generally has a larger moment of inertia and section modulus, has a larger bending and torsion resistance, can greatly reduce the weight of the structure, saving steel.
General seamless steel pipe is made of 10, 20, 30, 35, 45 and other high-quality carbon steel 16Mn, 5MnV and other low-alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other composite steel, hot-rolled or cold-rolled. 10, 20 and other low-carbon steel seamless pipe is mainly used in the fluid transportation pipeline. 45, 40Cr and other medium carbon steel made of seamless pipe is used to make machine parts. The seamless pipe is used to manufacture mechanical parts, such as automobiles, tractors, stress parts. General use of seamless steel pipe to ensure the strength and flattening test. Hot rolled steel pipe is delivered in hot rolled condition or heat treated condition; cold rolled is delivered in hot to heat treated condition. Low and medium pressure boiler seamless steel pipe: used in the manufacture of a variety of low and medium pressure boilers, superheated steam pipe, boiling water pipe, water-cooled wall pipe and locomotive boilers with superheated steam pipe, large smoke pipe, small smoke pipe and arch brick pipe.
Hot-rolled or cold-rolled (dial) seamless steel pipe from high-quality carbon structural steel. Mainly with 10, 20 steel manufacturing, in addition to ensuring the chemical composition and mechanical properties to do hydrostatic test, crimping, flaring, flattening and other tests. Hot rolled to hot rolled state delivery, cold rolled (dial) to heat treatment state delivery.
18.GB18248-2000 (seamless steel pipe for gas cylinders) is mainly used to make a variety of gas, hydraulic cylinders. Its representative materials are 37Mn, 34Mn2V, 35CrMo and so on.